Cast
- Tom Baker
- The Doctor
- Lalla Ward
- Romana
- Christopher Neame
- Skagra
- Daniel Hill
- Chris Parsons
- Denis Carey
- Professor Chronotis
- Victoria Burgoyne
- Clare Keightley
- David Brierly
- K9
- Gerald Campion
- Wilkin
- Shirley Dixon
- The Ship
- Derek Pollitt
- Caldera
- James Coombes
- The Krargs
- John Hallet
- Police Constable
- David Strong
- Man in Car
- James Muir
- Fisherman
- Derek Suthern
- Krarg
- Barnaby Edwards
- Krarg
- Tim Bentinck
- The Doctor - Body Double
- Toby Hadoke
- Continuity Announcer
- Graham Cole
- Scientist
